matthewSorensen/Phosphorescent Eu Glass

## Phosphorescent Eu Glass
This recipe isn't optimized for anything (not compatible with any base glass, nor particularly stable), but it does have a definite phosphoresce. XRD data showed that it was partially crystalline, which makes sense.

I originally melted it to confirm why I was having trouble stabilizing divalent Europium ions in some soda-lime opals. It turns out that Eu(II) is only stable in systems with an optical basicity below a certain threshold.

Try leaving out the silicon powder, as strictly speaking it shouldn't be required, and turns the glass a dark black, absorbing all light emitted from the interior of the material.


Base glass:

10g SiO2 (300+ mesh)
6g sodium tetraborate decahydrate (can substitute boric acid + Na carbonate)
1g Al(OH)3  (can substitute alumina, with proper ratio)
1g K2CO3


Phosphorescent glass:
10g unmelted base glass
0.1 g Eu2O3
0.1 g Si (finely powdered)

Melted in a 30ml alumina crucible at 2300F-ish in a slightly reducing atmosphere, but it should be suitable for much lower melting temperatures and heavily oxidizing environments.
	This recipe isn't optimized for anything (not compatible with any base glass, nor particularly stable), but it does have a definite phosphoresce. XRD data showed that it was partially crystalline, which makes sense.

	I originally melted it to confirm why I was having trouble stabilizing divalent Europium ions in some soda-lime opals. It turns out that Eu(II) is only stable in systems with an optical basicity below a certain threshold.

	Try leaving out the silicon powder, as strictly speaking it shouldn't be required, and turns the glass a dark black, absorbing all light emitted from the interior of the material.


	Base glass:

	10g SiO2 (300+ mesh)
	6g sodium tetraborate decahydrate (can substitute boric acid + Na carbonate)
	1g Al(OH)3 (can substitute alumina, with proper ratio)
	1g K2CO3


	Phosphorescent glass:
	10g unmelted base glass
	0.1 g Eu2O3
	0.1 g Si (finely powdered)

	Melted in a 30ml alumina crucible at 2300F-ish in a slightly reducing atmosphere, but it should be suitable for much lower melting temperatures and heavily oxidizing environments.